These sipper cups are anti-viral and resist all forms of bacteria, fungus, mold, and the like. Bio-based from authentic Himalayan pine needles each cup while being crafted saved up to 30 grams of virgin plastic was stopped from entering the landfill that also helps prevent forest fire incidents; saving precious flora and fauna. Additionally, this cup offers ISO/JIS approved 99.84% microbial reduction. This product is microwave safe and fills 475 ml. As per IPCC guidelines, each purchase accounts for your reducing total Carbon Dioxide emissions by 748 grams.